Created
April 10, 2014 00:15
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TikZ Liquid Tag Block for Jekyll
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| require "open4" | |
| module Jekyll | |
| class TikzBlock < Liquid::Block | |
| def parse(tokens) | |
| @nodelist ||= [] | |
| @nodelist.clear | |
| while token = tokens.shift | |
| if token =~ FullToken | |
| if block_delimiter == $1 | |
| end_tag | |
| return | |
| end | |
| end | |
| @nodelist << token if not token.empty? | |
| end | |
| end | |
| def render(context) | |
| content = @nodelist.join(' ') | |
| content = self.unindented(content) | |
| content = self.tikz_render(content) | |
| return '<div class="tikz">' + content + "</div>" | |
| end | |
| def unindented(content) | |
| lines = content.rstrip.split(/\r\n|\r|\n/).select { |line| line.size > 0 } | |
| indentation = lines.map do |line| | |
| match = line.match(/^(\s+)[^\s]+/) | |
| match ? match[1].size : 0 | |
| end | |
| indentation = indentation.min | |
| return indentation ? content.gsub(/^#{' |\t' * indentation}/, '') : content | |
| end | |
| def tikz_render(content) | |
| content << "\n" | |
| pid, stdin, stdout, stderr = Open4::popen4 "tikz2svg" | |
| stdin.puts content | |
| stdin.close | |
| out = "" | |
| stdout.each do |line| | |
| out << line | |
| end | |
| ignored, status = Process::waitpid2 pid | |
| if status != 0 | |
| puts out | |
| raise SyntaxError.new "Error rendering tikz" | |
| end | |
| return out | |
| end | |
| end | |
| Liquid::Template.register_tag("tikz", TikzBlock) | |
| end |
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Needs
tikz2svg.